Alex Richards
Donor
Eh...I'm still not convinced. The simple thing is here: George III (and his heirs) have the legal right to dispose of Corsica (although I'm sure in practice the Corsican government would want to control that decision). Parliament in London does not.
Corsica still may very well not apply, there being the Personal Union element and long history of protectorate status to take into account, but certainly by the late 19th/early 20th century protectorate the colonial powers were offering all sorts of prospective protectorate swaps in the colonies (Morocco, Tunisia, the German colonies, Zanzibar-Heligoland treaty etc.)